#include <stdio.h>

int factorsum(int number);
void PrintPN(int m, int n);

int main()
{
    int m, n;

    scanf("%d %d", &m, &n);
    if (factorsum(m) == m)
        printf("%d is a perfect number\n", m);
    if (factorsum(n) == n)
        printf("%d is a perfect number\n", n);
    PrintPN(m, n);

    return 0;
}

/* 你的代码将被嵌在这里 */
int factorsum(int number)
{
    int sum = 0;
    for (int i = 1; i < number; i++)
    {
        if (number % i == 0)
        {
            sum += i;
        }
    }
    return sum;
}

void PrintPN(int m, int n)
{
    int count = 0;
    for (int i = m; i <= n; i++)
    {
        if (factorsum(i) == i)
        {
            printf("%d = 1", i);
            for (int j = 2; j < i; j++)
            {
                if (i % j == 0)
                {
                    printf(" + %d", j);
                }
            }
            printf("\n");
            count++;
        }
    }
    if (count == 0)
        printf("No perfect number\n");
}